參數(shù)資料
型號： OPA830ID
英文描述： Low-Power, Single-Supply, Wideband Operational Amplifier
中文描述： 低功耗，單電源，寬帶運算放大器
文件頁數(shù)： 20/31頁
文件大?。?/td> 460K
代理商： OPA830ID
"#$
SBOS263B AUGUST 2004 REVISED JANUARY 2005
www.ti.com
20
OPA830
+5V
5V
V
O
50
V
IN
R
F
750
348
50
Source
150
R
G
750
6.8
μ
F
+
6.8
μ
F
+
0.1
μ
F
0.1
μ
F
0.01
μ
F
Figure 3. DC-Coupled, G = +2, Bipolar Supply
Specification and Test Circuit
SINGLE-SUPPLY ADC INTERFACE
The ADC interface on the front page shows a DC-coupled,
single-supply ADC driver circuit. Many systems are now
requiring +3V supply capability of both the ADC and its
driver. The OPA830 provides excellent performance in this
demanding application. Its large input and output voltage
ranges and low distortion support converters such as the
THS1040 shown in the figure on page 1. The input
level-shifting circuitry was designed so that V
IN
can be
between 0V and 0.5V, while delivering an output voltage
of 1V to 2V for the THS1040.
DC LEVEL-SHIFTING
Figure 4 shows a DC-coupled noninverting amplifier that
level-shifts the input up to accommodate the desired
output voltage range. Given the desired signal gain (G),
and the amount V
OUT
needs to be shifted up (
V
OUT
)
when V
IN
is at the center of its range, the following
equations give the resistor values that produce the desired
performance. Assume that R
4
is between 200
and
1.5k
.
NG = G + V
OUT
/V
S
R
1
= R
4
/G
R
2
= R
4
/(NG G)
R
3
= R
4
/(NG 1)
where:
NG = 1 + R
4
/R
3
V
OUT
= (G)V
IN
+ (NG G)V
S
Make sure that V
IN
and V
OUT
stay within the specified
input and output voltage ranges.
OPA830
+V
S
V
OUT
V
IN
R
3
R
2
R
1
R
4
Figure 4. DC Level-Shifting
The circuit on the front page is a good example of this type
of application. It was designed to take V
IN
between 0V and
0.5V and produce V
OUT
between 1V and 2V when using
a
+3V
supply.
This
means
V
OUT
= 1.50V G
×
0.25V = 1.00V. Plugging these
values into the above equations (with R
4
= 750
) gives:
NG = 2.33, R
1
= 375
, R
2
= 2.25k
, and R
3
= 563
. The
resistors were changed to the nearest standard values for
the front page circuit.
G
=
2.00, and
AC-COUPLED OUTPUT VIDEO LINE DRIVER
Low-power and low-cost video line drivers often buffer
digital-to-analog converter (DAC) outputs with a gain of 2
into a doubly-terminated line. Those interfaces typically
require a DC blocking capacitor. For a simple solution, that
interface often has used a very large value blocking
capacitor (220
μ
F) to limit tilt, or SAG, across the frames.
One approach to creating a very low high-pass pole
location using much lower capacitor values is shown in
Figure 5. This circuit gives a voltage gain of 2 at the output
pin with a high-pass pole at 8Hz. Given the 150
load, a
simple blocking capacitor approach would require a 133
μ
F
value. The two much lower valued capacitors give this
same low-pass pole using this simple
SAG correction
circuit of Figure 5.
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參數(shù)描述
OPA830ID 制造商:Texas Instruments 功能描述:IC OP-AMP VFB 110MHZ SGL 8SOIC 制造商:Texas Instruments 功能描述:IC, OP-AMP VFB 110MHZ SGL 8SOIC 制造商:Texas Instruments 功能描述:IC, OP-AMP VFB 110MHZ SGL 8SOIC; Op Amp Type:Low Power; No. of Amplifiers:1; Slew Rate:500V/s; Supply Voltage Range: 1.4V to 5.5V; Amplifier Case Style:SOIC; No. of Pins:8; Bandwidth:250MHz; Operating Temperature Min:-40C; ;RoHS Compliant: Yes
OPA830IDBV 制造商:TI 制造商全稱:Texas Instruments 功能描述:Low-Power, Single-Supply, Wideband Operational Amplifier
OPA830IDBVR 功能描述:高速運算放大器 OPA830: Low-Power Sngl-Sply Oper Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
OPA830IDBVRG4 功能描述:高速運算放大器 OPA830: Low-Power Sngl-Sply Oper Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
OPA830IDBVT 功能描述:高速運算放大器 OPA830: Low-Power Sngl-Sply Oper Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
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